Edavaed weston



(No Model.)

B. WESTON.

"INGANDBSGENT LAMP.

No. 298.325. Patented May 6, 1884.

Attest:

TINTTED TATns PATENT Trice.

ED\VAED W'ESTON, OF NEWARK, NEW JERSEY, ASSIGNOR TO THE UNITED STATES ELECTRIC LIGHTING COMPANY, OF NEW YORK, N. Y.

INCANDESCENT LAMP.

SPECIFICATION forming part of Letters Patent No. 298,3?5, dated May 6, 1884.

Application filed October 4, =83. No model To all whom it may concern.-

Be it known that I EDWARD XVESTON, a

subject of the Queen of Great Britain, and a resident of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Incandescent Lamps, of which the following is a specification, reference being had to the drawings accompanying and forming a part of the same.

My invention relates to incandescent lamps; and it consists in a carbonized conducting strip or filament in the form of a flat or flattened spiral, and in the combination of the same with the supporting-wires of an exhausted lamp globe. Conductors of this character possess many advantages over the ordinary i'orms, which have usually been simple loops, flat or twisted, or sometimes true spirals, for when the loop is bent or formed as a flattened spiral a greater amount of useful radiatingsurface is obtained, a carbon of greater length may be used in a globe of given size, and the process of manufacture much simplified.

The method of making these carbons which I prefer is as follows: I wind spirally around bars, flat with rounded edges, or elliptical in cross-section, long strips of carbonizable material. After heating or baking these strips sufficiently to give them a permanent set, I

remove them and place them around bars or.

plates of hard carbon of similar shape to the first, but considerably smaller. A desired number of these are inclosed in a muffle and subjected. to a higher heat. In carbonizing, the strips contract until they lie close to the carbon bars which they surround. They are then removed from the carbon bars, divided into sections of the desired length, andmounted in the lamps. This method may be varied by winding a long strip, or a number of short strips, around a flat bar of wood, or some material that has about the same rate of contraction in carbonizing as the material of the strip, and then carbonizing both the bar and strip together. I11 either case the enlarged clamping ends may be formed as part of the strip or strips, or afterward joined onto it in any well-known manner. "When completed, the conductors should have the form of a spiral, which is formed upon a body with an elliptical or similar cross-scction, in which one axis exceeds in length to a considerable degree the other. The conductors are mount- 5 5 ed on conducting-wires, and sealed in an exhausted globe in the usual way.

In the drawings, Figure l is a view of a lamp containing a carbon conductor made in accordance with my invention. Fig. 2 is a representation of a strip or blank of the material after carbonization. Fig. 3 is a View of a carbon with the edge presented. Fig. 4 shows side view of the same.

A designates the lamp-globe, B the carbon, and O O the conductors upon which the carbonis mounted.

The materials used for the carbon conductor may be paper, wood, amorphous cellulose, or any of the carbonizable substances commonly used.

I do not claim herein the method or process of manufacturing these conductors which I have described, as I reserve the same for subject of other applications; but, without reference to the manner in which the conductors are or may be formed,

XVhat I now claim is 1. A carbon conductor for incandescent lamps in the form of a flat or flattened spiral, substantially as described.

2. The combination, with an exhausted globe or receiver and metal conductors secured therein, of a carbonized strip or filament in the form of atlat or flattened loop, substantially as described.

In testimony whereof I have hereunto set my hand this 1st day of October, 1883.

EDNVARD IVESTON.

Witnesses:

H. A. BEOKMEYER, R. W. BLOEMEKE. 

